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. Author manuscript; available in PMC: 2017 Jan 1.
Published in final edited form as: J Occup Environ Hyg. 2016 Jan;13(1):30–39. doi: 10.1080/15459624.2015.1072278

Table 3.

Optimizing the microwave digestion conditions for 4 nm TiO2 nanoparticles.

Acid mixturea Recovery (%)
HNO3 HNO3:H2SO4 (1:1) HNO3:H2SO4 (1:2) H2SO4
360 μg 21 ± 1 87 ± 4 94 ± 3 86 ± 3
Digestion timeb 15 min 30 min 45 min
36 μg 87 ± 4 81 ± 5 93 ± 5
360 μg 94 ± 3 92 ± 6 97 ± 4
Digestion temperaturec 190°C 210°C
36 μg 93 ± 5 92 ± 3
360 μg 97 ± 4 103 ± 1
360 μg 97 ± 4 103 ± 1
a

Temperature-190°C/time-15 min

b

Temperature-190°C/acid mixture-H2SO4 & HNO3 (2:1)

c

Time-45 min/acid mixture-H2SO4 & HNO3 (2:1)